US 12,146,477 B2
Bidirectional, linear and binary, segmented antagonistic servomechanism-based shape memory alloy (SMA) actuator
Bhargaw Hari Narayan, Madhya Pradesh (IN); Joshi Tilak Chandra, Madhya Pradesh (IN); Hashmi Syed Azhar Rasheed, Madhya Pradesh (IN); Srivastava Avanish Kumar, Madhya Pradesh (IN); and John Pretesh, Madhya Pradesh (IN)
Assigned to COUNCIL OF SCIENTIFIC AND INDUSTRIAL RESEARCH, New Delhi (IN)
Filed by COUNCIL OF SCIENTIFIC AND INDUSTRIAL RESEARCH, New Delhi (IN)
Filed on Oct. 20, 2023, as Appl. No. 18/491,436.
Claims priority of application No. 202211060660 (IN), filed on Oct. 21, 2022.
Prior Publication US 2024/0133367 A1, Apr. 25, 2024
Prior Publication US 2024/0229779 A9, Jul. 11, 2024
Int. Cl. F03G 7/06 (2006.01); B33Y 30/00 (2015.01)
CPC F03G 7/0635 (2021.08) [F03G 7/06143 (2021.08); F03G 7/0616 (2021.08); F03G 7/062 (2021.08); F03G 7/064 (2021.08); F03G 7/0665 (2021.08); B33Y 30/00 (2014.12)] 11 Claims
OG exemplary drawing
 
1. A Bidirectional, Linear and Binary, Segmented Antagonistic Servomechanism-based Shape Memory Alloy (SMA) Actuator in a straight configuration, comprising:
a S-type long tail main stroke transmitting lever; and
a plurality of S-type part-modules disposed in a closely spaced arrangement and adapted to undergo a reciprocal translation in a first direction, wherein the plurality of S-type part-modules comprises:
a plurality of segments having SMA elements, wherein the plurality of segments having the SMA elements are connected between the adjacent S-type part-modules and the S-type long tail main stroke transmitting lever, wherein each segment of the plurality of segments having the SMA elements extends longitudinally in the first direction,
wherein the S-type long tail main stroke transmitting lever undergoes reciprocal translation in a return direction from the first direction by the closely spaced arrangement in an antagonistic configuration by the plurality of S-type part-modules,
wherein the antagonistic configuration of the plurality of S-type part-modules comprises the plurality of segments having the SMA elements, each segment of the plurality of segments extends longitudinally in the return direction and the plurality of segments having the SMA elements is connected between two adjacent S-type part-modules and the S-type long tail main stroke transmitting lever,
wherein the antagonistic configuration of the plurality of S-type part-modules in series cascading arrangement at both sides of the S-type long tail main stroke transmitting lever is to provide an additive resultant stroke in both forward and reverse directions,
wherein the additive resultant stroke of the SMA Actuator is used to provide linear and angular or circular motion of actuation,
wherein the SMA Actuator is capable to provide variable stroke displacement from minimum to maximum stroke length with variable magnitude of actuation force in both the forward and reverse directions,
wherein, based on a joule heating of the SMA elements beyond a phase transition temperature, the S-type part-modules are adapted to translate the displacement to the S-type long tail main stroke transmitting lever in the first direction, each S-type part-module undergoing a stroke displacement concerning the adjacent S-type part-modules,
wherein the S-type long tail main stroke transmitting lever provides a motion between the first direction and the reverse direction of full stroke displacement forming the straight configuration, and
wherein the SMA Actuator is designed to accommodate the whole length of the SMA element in the segments of the SMA elements, that are cascaded in series arrangement along with movable S-type rigid strips.